Ms. Evgenia V. Zubkova Profile

Evgenia V. Zubkova

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Proceedings Article | 14 October 2019 Presentation + Paper

Spaceborne SAR observations of internal solitary waves in the Chukchi and Beaufort Seas

Igor Kozlov, Evgenia Zubkova

Proceedings Volume 11150, 111500F (2019) https://doi.org/10.1117/12.2532604

KEYWORDS: Synthetic aperture radar, Hydrology, Calibration, Radar, Filtering (signal processing), MATLAB, Digital filtering, Image filtering, Electronic filtering, Optical inspection

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In this work we present the results of internal solitary wave (ISW) observations derived from high-resolution spaceborne synthetic aperture radar (SAR) measurements acquired over the seasonally ice-free Chukchi and Beaufort Seas. The information on internal wave properties and locations was obtained from Envisat Advanced SAR (ASAR) images acquired during May-October 2007 and 2011. Altogether, 233 ISW packets were identified in 727 ASAR images. As observed, there is no significant difference in the normalized number of ISW observations between 2007 and 2011, while most of the waves were detected in July (33%) and August (43%). Geographically, most of the waves were observed over shelf and shelf break regions (94%), while only 6% of them were found over depths exceeding 200 m. In the Chukchi Sea, the waves were frequently observed in the northern part of the sea centered at about 72.6° N, 168° W, in its southwestern part, around Herald Shoal, near the Barrow Canyon, and in the Bering Strait. In the Beaufort Sea, some ISW activity was observed along the shelf break and north of Cape Bathurst, while a major hot spot of ISW generation was found on the Mackenzie Shelf. Maps of selected ISW properties, including their propagation direction, crest length and wavelength of leading waves provide further details about spatial characteristics of the observed internal waves.

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